Failed opening required ‘PHPMailerAutoload.php’ [duplicate]

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Uncaught Error: Failed opening required ‘PHPMailerAutoload.php’
Warning: require(PHPMailerAutoload.php): Failed to open stream:

I am trying to send an email using PHP, whenever I want to send an email but the email is not sent through and I think it is because the composer is not installed.

I want my site to send a student email after registration.

<?php
require 'PHPMailer/PHPMailer/PHPMailerAutoload.php';
require 'PHPMailer/PHPMailer/class.smtp.php';
require 'PHPMailer/PHPMailer/class.phpmailer.php';

use PHPMailerPHPMailerPHPMailer;

include('database/config.php');

if (isset($_POST['submit'])) {
    $FirstName = $_POST['FirstName'];
    $LastName = $_POST['LastName'];
    $Gender = $_POST['Program'];
    $Email = $_POST['Email'];
    $Subject1 = $_POST['Subject1'];
    $Subject2 = $_POST['Subject2'];
    $Address = $_POST['Address'];
    $ContactNum = $_POST['ContactNum'];
    $Password = $_POST['password'];

    $hashed_password = password_hash($Password, PASSWORD_DEFAULT);
    $reference = $_POST['reference'];
    $proof = $_FILES['proof']['name'];
    $tmp_name = $_FILES['proof']['tmp_name'];
    $target_dir = "uploads/";
    $target_file = $target_dir . basename($proof);

    if (move_uploaded_file($tmp_name, $target_file)) {
        $Actions = "Pending";

        $checkQuery = "SELECT COUNT(*) as count FROM Students WHERE Email = '$Email'";
        $result = $conn->query($checkQuery);
        $row = $result->fetch_assoc();
        if ($row['count'] > 0) {
            // Email already exists, display error message or take appropriate action
        } else {
            $sql = "INSERT INTO Students (FirstName, LastName, Subject1, Subject2, Email, Address, ContactNum, Password,Actions,reference,proof) VALUES ('$FirstName', '$LastName', '$Subject1', '$Subject2', '$Email', '$Address', '$ContactNum', '$hashed_password', '$Actions','$reference', '$proof')";

            if ($conn->query($sql) === TRUE) {
                // Send email
                $mail = new PHPMailer(true);
                try {
                    //Server settings
                    $mail->isSMTP();                                      // Set mailer to use SMTP
                    $mail->Host = 'smtp.example.com';                     // Specify main and backup SMTP servers
                    $mail->SMTPAuth = true;                               // Enable SMTP authentication
                    $mail->Username = '[email protected]';           // SMTP username
                    $mail->Password = '*********';              // SMTP password
                    $mail->SMTPSecure = 'tls';                            // Enable TLS encryption, `ssl` also accepted
                    $mail->Port = 587;                                    // TCP port to connect to

                    //Recipients
                    $mail->setFrom('[email protected]', 'DSI TUTORING');
                    $mail->addAddress($Email, $FirstName . ' ' . $LastName);     // Add a recipient

                    // Content
                    $mail->isHTML(true);                                  // Set email format to HTML
                    $mail->Subject = 'Registration Confirmation';
                    $mail->Body = 'Dear ' . $FirstName . ',<br><br>Thank you for registering. Your registration is pending approval.<br><br>Best regards,<br>Your Organization';

                    if ($mail->send()) {
                        // Redirect to thank you page
                        $_SESSION['user_id'] = $conn->insert_id;
                        header("Location: thank_you.php");
                        exit;
                    }
                } catch (Exception $e) {
                    echo "Message could not be sent. Mailer Error: {$mail->ErrorInfo}";
                }
            } else {
                echo "Error: " . $sql . "<br>" . $conn->error;
            }
        }

        $conn->close();
    }
}
?>